Change search
ReferencesLink to record
Permanent link

Direct link
Theoretical Implications of Thermal Emission from Gamma-Ray Bursts
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-9769-8016
2009 (English)In: GAMMA-RAY BURST / [ed] Meegan, C; Gehrels, N; Kouveliotou, C, 2009, Vol. 1133, 317-322 p.Conference paper (Other academic)
Abstract [en]

Recent analysis show evidence for a thermal emission component that accompanies the non-thermal emission during the prompt phase of GRBs. We show that this component is naturally explained by considering emission from the photosphere. The photosphere of a relativistically expanding plasma wind strongly depends on the angle to the line of sight, θs. As a result, thermal emission can be seen after tens of seconds. Using probability density function P(r,θs) to describe photon escape at radius r and angle θs, we show that the thermal flux is expected to decay at late times as F$_BB$~t$^-2$, and the observed temperature decays as T~t$^-α$, with α~1/2-2/3. We discuss the relation between thermal emission and high energy, non-thermal spectra observed by FERMI. We show how thermal emission can be used to directly measure the Lorentz factor of the flow and the initial radius of the jet.

Place, publisher, year, edition, pages
2009. Vol. 1133, 317-322 p.
, AIP Conference Proceedings, ISSN 0094-243X ; 1133
Keyword [en]
gamma-ray sources; gamma-ray bursts, Radiation belts, Density functional theory, local density approximation, gradient and other corrections
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:kth:diva-81246DOI: 10.1063/1.3155909ISI: 000267717300076ScopusID: 2-s2.0-70450193476OAI: diva2:497425
6th Huntsville Symposium on Gamma-Ray Burst. Huntsville, AL. OCT 20-23, 2008
QC 20120302Available from: 2012-02-10 Created: 2012-02-10 Last updated: 2012-03-02Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Ryde, Felix
By organisation
Particle and Astroparticle Physics
Astronomy, Astrophysics and Cosmology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 9 hits
ReferencesLink to record
Permanent link

Direct link